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kotlinlang

Well, so it’s time for me to finally try TornadoFX :slightly_smiling_face: I’ve set it up and it shows hello world, but now I’m trying to create a view with a parameter, and I don’t see how to do it. Any hints? Didn’t find anything in the guide…

I basically want to create a TreeView, but passing root as a parameter.

<@U092308M7> TornadoFX expects you to declare your parameters in your view:
```
class MyTreeView : Fragment() {
     val myParam : T by param()
     override val root = treeview { ... }
}
```
and instantiate them via:
```
val myTreeView = find&lt;MyTreeView&gt;(params = mapOf(
    MyTreeView::myParam to value
))
```

I have a preference for passing these in the constructor instead and it seems that's functionally equivalent AFAICT.

Huh… So for a View specified in App arguments, how do I set params?

you can't without overriding this: <https://github.com/edvin/tornadofx/blob/master/src/main/java/tornadofx/App.kt#L76-L98>

Well, find&lt;View&gt; did work in `init` block of an App

yeah, I think find is valid within any EventTarget.  It seems like those extension methods walk up the `Node` hierarchy to find the scope.

<@U092308M7> Instead of passing parameters you should look into injected ViewModels and Scopes. Unless somebody else elaborates I'll try to later tonight, not in front of a computer right now :slightly_smiling_face:

I’ve switched to bound properties already :slightly_smiling_face:

I dig it from simplest imperative stuff to declarative

Haha, great :slightly_smiling_face: Sorry, really busy these days, I hate not having time to answer everyone

np, I’ve already implemented binding with debouncing, so I’m learning :slightly_smiling_face: